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WO2018216199A1 - Procédé de soudage laser et objet soudé au laser - Google Patents

Procédé de soudage laser et objet soudé au laser Download PDF

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Publication number
WO2018216199A1
WO2018216199A1 PCT/JP2017/019714 JP2017019714W WO2018216199A1 WO 2018216199 A1 WO2018216199 A1 WO 2018216199A1 JP 2017019714 W JP2017019714 W JP 2017019714W WO 2018216199 A1 WO2018216199 A1 WO 2018216199A1
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WO
WIPO (PCT)
Prior art keywords
panel
gap
laser
laser welding
convex portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/019714
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English (en)
Japanese (ja)
Inventor
英生 斉藤
木下　圭介
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to PCT/JP2017/019714 priority Critical patent/WO2018216199A1/fr
Publication of WO2018216199A1 publication Critical patent/WO2018216199A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/32—Bonding taking account of the properties of the material involved

Definitions

  • the present invention relates to a laser welding method and a laser weldment for joining a plurality of panel materials stacked on each other.
  • Patent Document 1 discloses a technique in which a portion where a plurality of metal members are overlapped is irradiated with laser light for welding.
  • a galvanized steel sheet used as a metal member for automobiles it is necessary to perform laser welding in a state where a gap is provided between the metal members in order to release zinc gas generated at the time of welding.
  • the laser beam is irradiated and welded in a state where a space is formed between the superposed metal members.
  • the space is formed by causing the laser light to pass through the superposed metal members, thereby forming a protrusion which rises toward one of the metal members toward the other metal member.
  • the panel material which consists of a metal member for motor vehicles is comparatively large, it has dispersion
  • this invention aims at performing laser welding in the state which formed the suitable clearance gap between panel materials.
  • a convex portion formed on at least one of the panel members is brought into contact with the other panel member to overlap the panel members, thereby forming a first gap between the panel members.
  • a plurality of stacked panel materials are held by a holding tool so that the first gap is narrowed at the held position different from the convex portion, and the panel materials between the panel members at a position farther from the convex portion than the held position Form a second gap narrower than the first gap.
  • Laser welding is performed on the panel material at the portion where the second gap is formed.
  • laser welding can be performed in a state where an appropriate gap is formed between panel materials.
  • FIG. 1 is a perspective view of a laser weld processed by a laser welding method according to an embodiment of the present invention.
  • FIG. 2A is a plan view of the laser weld of FIG.
  • FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A.
  • FIG. 3A is an operation process diagram when setting a panel material forming a convex portion in a mold in manufacturing the laser welded product of FIG. 1.
  • FIG. 3B is an operation process diagram for forming a projection on the panel material of FIG. 3A.
  • FIG. 4A is an operation process diagram showing a state in which the panel material on which the convex portion of FIG. 3B is formed and another panel material are superimposed.
  • FIG. 3A is an operation process diagram when setting a panel material forming a convex portion in a mold in manufacturing the laser welded product of FIG. 1.
  • FIG. 3B is an operation process diagram for forming a projection on the panel material of FIG. 3A.
  • FIG. 4B is an operation process diagram showing a state where a spot weld is formed on the panel material of FIG. 4A.
  • FIG. 4C is an operation process diagram showing a state in which a laser welded portion is formed on the panel material of FIG. 4B.
  • FIG. 5 is a side view showing a door opening of a car.
  • FIG. 6 is a detail view showing a portion B of FIG.
  • FIG. 7 is a cross-sectional view taken along the line CC in FIG.
  • FIG. 8 is a graph showing the displacement of the second gap at a substantial length along the curved shape of the spot weld of FIG.
  • FIG. 9 is a graph showing the displacement of the second gap in the state where there is a variation in the shape accuracy of the flange.
  • FIG. 10 is a graph showing the displacement of the gap when the projection is not formed on the panel material.
  • FIG. 11 is a cross-sectional view showing an example of formation of the convex portion in the case where the number of panel members is three.
  • FIG. 12 is a cross-sectional view showing an example of the formation of the convex portion when the number of panel members is three.
  • FIG. 13 is a cross-sectional view showing an example of formation of the convex portion in the case where three panel members are used.
  • FIG. 14 is a cross-sectional view showing an example of formation of the convex portion when the number of panel members is three.
  • the laser-welded article 1 is welded and joined in a state in which the first panel material 3 and the second panel material 5 both of which are made of metal members are superimposed on each other.
  • the first panel member 3 has two convex portions 3b and 3c formed in the vicinity of the side edge 3a.
  • the two convex portions 3b and 3c are formed at intervals along the side edge 3a.
  • spot welded portions 7 and 9 are formed at two positions in the vicinity of each of the convex portions 3b and 3c between the two convex portions 3b and 3c.
  • two convex parts 3b and 3c are made into the rectangular shape by planar view, as shown to FIG. 2A, circular shape may be sufficient and another shape may be sufficient.
  • the laser weldment 1 forms a laser weld 11 between the two spot welds 7 and 9 in a substantially straight line along the side edge 3a.
  • the laser welding portion 11 is formed between a position near the one spot welding portion 7 and a position near the other spot welding portion 9. That is, the laser welding portion 11 is at a position farther from the convex portion 3 b than the spot welding portion 7. Similarly, the laser welding portion 11 is at a position farther from the convex portion 3 c than the spot welding portion 9.
  • the convex portions 3 b and 3 c of the first panel member 3 protrude toward the second panel member 5, and the tip end surface is in contact with the second panel member 5. Thereby, a first gap t1 is formed between the first panel material 3 and the second panel material 5.
  • the two convex portions 3b and 3c have the same projecting height, and the projecting height substantially corresponds to the first gap t1.
  • the first gap t1 is, for example, about 1.0 mm.
  • the first gap t1 is a gap between the first panel material 3 and the second panel material 5 before the spot welded parts 7 and 9 and the laser welded part 11 are formed.
  • a second gap t2 is formed between the first panel material 3 and the second panel material 5 in a portion substantially corresponding to the laser welded portion 11.
  • the second gap t2 is, for example, 0.3 mm to 0.05 mm.
  • the second gap t2 is a gap between the first panel material 3 and the second panel material 5 after forming the spot welds 7 and 9 and before forming the laser weld 11. It is.
  • the spot welded portion from the convex portion 3b is between the convex portion 3b and the spot welded portion 7 It becomes smaller gradually as it goes to 7.
  • the gap between the first panel material 3 and the second panel material 5 the gap between the convex portion 3 c and the spot welded portion 9 gradually increases from the convex portion 3 c toward the spot welded portion 9. It is getting smaller.
  • the laser weldment 1 is manufactured by a manufacturing method including the laser welding method described below.
  • the convex portions 3b and 3c of the first panel member 3 are formed by a press die 17 composed of a pair of upper and lower dies 13 and 15, as shown in FIGS. 3A and 3B.
  • the upper mold 13 includes mold recesses 13a and 13b having substantially the same shape as the protrusions 3b and 3c
  • the lower mold 15 includes mold protrusions 15a and 15b corresponding to the mold recesses 13a and 13b. There is.
  • the first panel material 30 before forming the convex portions 3b and 3c is disposed between the upper and lower molds 13 and 15 and press-formed on the first panel material 30.
  • the 1st panel material 3 which has convex part 3b, 3c is obtained.
  • Recesses 3 d and 3 e are formed on the back surface corresponding to the protrusions 3 b and 3 c of the first panel member 3.
  • the second panel material 5 is superimposed on the first panel material 3.
  • the tip end surfaces of the convex portions 3 b and 3 c abut on the lower surface of the second panel member 5.
  • a first gap t1 substantially corresponding to the height of the convex portions 3b and 3c is formed between the first panel material 3 and the second panel material 5.
  • the first gap t1 is about 1.0 mm as described above.
  • the pair of electrode tips 19a and 19b of the spot welding gun 19 as a clamping tool applies pressure to the held positions of the first and second panel members 3 and 5 from both the upper and lower sides. In the state, the first panel material 3 is bent by being held. Similarly, when forming the spot welding portion 9, the clamping positions of the first and second panel members 3 and 5 are vertically moved by the pair of electrode tips 21a and 21b of the spot welding gun 21 as a clamping tool. The first panel member 3 is bent by being held in a pressurized state from both sides. The pressure applied by the spot welding guns 19 and 21 at this time is set such that the first gap t1 is narrowed to be the second gap t2.
  • the second gap t2 is, for example, 0.3 mm to 0.05 mm as described above.
  • the spot welding guns 19 and 21 operate in synchronization with each other.
  • laser welding is performed by irradiating laser light 23 from the side of the first panel material 3 between the spot welded parts 7 and 9, for example.
  • the laser welding portion 11 is formed.
  • the laser beam 23 is irradiated while moving linearly from, for example, a position near the spot welded portion 7 to a position near the spot welded portion 9 along the side edge 3 a shown in FIG. 1. Thereby, the laser weldment 1 as shown in FIG. 1, FIG. 2A and FIG. 2B is completed.
  • the laser welding method according to the present embodiment is a laser welding method in which the first and second panel members 3 and 5 stacked on each other are joined together, and among the first and second panel members 3 and 5 adjacent to each other, One of the first panel members 3 has convex portions 3 b and 3 c protruding toward the other second panel member 5.
  • the first gap t1 is formed between the first and second panel members 3 and 5 by bringing the convex portions 3b and 3c into contact with the second panel member 5 and overlapping the panel members 3 and 5 with each other.
  • the overlapping first and second panel members 3 and 5 are pressure-held by the spot welding guns 19 and 21 so that the first gap t1 becomes narrower at the held position different from the convex portions 3b and 3c.
  • the spot welds 7 and 9 are formed.
  • the spot welds 7 and 9 are interposed between the panel members 3 and 5 on the opposite side with the convex portions 3b and 3c, a second narrower than the first gap t1.
  • Laser welding is performed on the first and second panel members 3 and 5 at the portion where the second gap t2 is formed, and the first and second panel members 3 and 5 are joined by welding.
  • the first gap t1 is formed in advance between the first and second panel members 3 and 5 by the convex portions 3b and 3c.
  • the two gaps t2 can be formed more reliably.
  • Laser welding is performed in a state in which the second gap t2 is formed.
  • the second gap t2 is extremely narrow, for example, about 0.3 mm to 0.05 mm, so that welding defects such as underfill and burn through can be suppressed, and the welding strength is improved. That is, the second gap t2 is a proper gap that can secure welding strength while releasing zinc gas. If the gap is less than 0.05 mm, zinc gas can not be efficiently released, and if it exceeds 0.3 mm, welding defects such as underfill and burn-through occur to reduce the welding strength.
  • the two welded portions 3b and 3c are formed at an interval, and the spot welded portions 7 and 9 corresponding to the held positions are located between the two projected portions 3b and 3c. It is provided in two places of the vicinity position of each convex part 3b, 3c. Laser welding is performed on the first and second panel members 3 and 5 between the two spot welds 7 and 9. In this case, by forming the two spot welds 7 and 9, the second gap t2 between the first and second panel members 3 and 5 can be made more uniform.
  • the holding tool is the spot welding guns 19 and 21 and the spot welding guns 19 and 21 perform spot welding with respect to the held position.
  • the laser welding operation after forming the spot welds 7 and 9 can be efficiently performed without the holding tool (spot welding guns 19 and 21) becoming an obstacle.
  • the laser welding method of the present embodiment there is a step of forming the convex portions 3b and 3c on the first panel member 3 of one of the first and second panel members 3 and 5 adjacent to each other.
  • the first panel member 3 may be a flat panel member having no convex portion.
  • the laser weldment according to the present embodiment is the laser weldment 1 in which the first and second panel members 3 and 5 stacked on each other are joined together, and the first and second panel members 3 and 5 are overlapped.
  • the first panel material 3 is provided on one of the first and second panel materials 3 and 5 that are adjacent to each other in the first state, and the second panel material 5 protrudes toward the other second panel material 5.
  • convex portions 3b and 3c in contact with the A first gap t1 is formed between the first and second panel members 3 and 5 by the convex portions 3b and 3c.
  • first and second panel members 3 and 5 which have been superposed are provided with the spot welding guns 19 and 21 so as to form a second gap narrower than the first gap t1 at a sandwiching position different from the protrusions 3b and 3c.
  • spot welds 7 and 9 which are pressure-sandwiched and welded.
  • the first and second panel members 3 and 5 of the portion on the opposite side of the convex portions 3b and 3c with the spot welded portions 7 and 9 in between and the second gap t2 formed are joined by laser welding Laser welding portion 11.
  • the second optimum for the laser welding is formed more reliably.
  • Laser welding is performed in a state in which the second gap t2 is formed.
  • the second gap t2 is extremely narrow, for example, about 0.3 mm to 0.05 mm, which can suppress welding defects such as underfill and burn through, and the welding strength is improved. Quality is improved.
  • FIG. 5 shows the vicinity of the left front door opening 27 in the vehicle body 25 of the automobile.
  • the door opening 27 is formed on the inner side surrounded by the front pillar 29, the center pillar 31, the side sill 33 and the roof rail 34.
  • FIG. 6 is an enlarged view of a portion B corresponding to the lower right corner portion of the door opening 27 in FIG.
  • FIG. 7 which corresponds to a cross-sectional view taken along the line C-C in FIG. 6, the inner panel 3A and the outer panel 5A are provided as a plurality of panel members.
  • the inner panel 3A corresponds to the first panel material 3 in FIG. 1
  • the outer panel 5A corresponds to the second panel material 5 in FIG. Therefore, the convex portions 3Ab and 3Ac are formed on the inner panel 3A.
  • 7 is a state before forming the spot welded parts 7A and 9A and the laser welded part 11A shown in FIG. 6, and the position shown by the arrow P is a portion to be pressure-held by the spot welding gun. The position shown is a site to which laser light is applied.
  • the inner panel 3A and the outer panel 5A respectively include flanges 3Af and 5Af, and vertical walls 3Aw and 5Aw that bend in directions away from the flanges 3Af and 5Af. That is, vertical wall 3Aw of inner panel 3A is bent downward in FIG. 7 from flange 3Af, and vertical wall 5Aw of outer panel 5A is bent upward in FIG. 7 from flange 5Af.
  • the inner panel 3A extends from the end of the vertical wall 3Aw opposite to the flange 3Af to the inner panel main body 3Ah extending substantially parallel to the flange 3Af on the opposite side to the flange 3Af (door opening 27).
  • the outer panel 5A includes an outer panel main body 5Ah that extends substantially in parallel with the flange 5Af on the opposite side of the flange 5Af (door opening 27) from the end of the vertical wall 5Aw opposite to the flange 5Af.
  • a closed cross section is formed between the inner panel body 3Ah and the outer panel body 5Ah.
  • the convex portions 3Ab and 3Ac are provided in the vicinity of the side edge portion 3Aa of the flange 3Af of the inner panel 3A.
  • the side edge 3Aa here is concavely curved as shown in FIG. 6 together with the side edge 5Aa of the flange 5Af.
  • the convex portions 3Ab and 3Ac contact the flange 5Af.
  • a first gap t1 is formed between the flanges 3Af and 5Af.
  • two convex parts 3Ab and 3Ac are formed at intervals along the side edge parts 3Aa and 5Aa.
  • spot welded portions 7A and 9A are formed at two sandwiching positions in the vicinity of the respective convex portions 3Ab and 3Ac between the two convex portions 3Ab and 3Ac.
  • the spot welds 7A and 9A are located closer to the vertical walls 3Aw and 5Aw than the protrusions 3Ab and 3Ac.
  • the laser welded portion 11A is formed in a curved shape along the vertical wall 5Aw between the two spot welded portions 7A and 9A.
  • the laser welding portion 11A is formed between a position near the one spot welding portion 7A and a position near the other spot welding portion 9A. That is, the laser welding portion 11A is at a position farther from the convex portion 3Ab than the spot welded portion 7A, and is at a position farther from the convex portion 3Ac than the spot welded portion 9A.
  • the laser welded portion 11A is formed at a position closer to the vertical walls 3Aw and 5Aw than the convex portions 3Ab and 3Ac and the spot welded portions 7A and 9A.
  • a set of gap correction elements constituted by the two convex portions 3Ab, 3Ac, the spot welded portions 7A, 9A and the laser welded portion 11A described above is set over the entire circumference of the flanges 3Af, 5Af.
  • the second gap t2 which is a proper gap can be secured over the entire circumference of the door opening 27.
  • the convex portion 3Ab can be shared between two adjacent sets of gap correction elements.
  • the convex portion 3Ac can be shared between two adjacent sets of gap correction elements.
  • the inner panel 3A and the outer panel 5A have the flanges 3Af and 5Af on which laser welding is performed, and the longitudinal walls 3Aw and 5Aw bent in directions away from the flanges 3Af and 5Af.
  • the convex portions 3Ab, 3Ac are positioned in the vicinity of the side edge portions 3Aa, 5Aa opposite to the vertical walls 3Aw, 5Aw of the flanges 3Af, 5Af.
  • the spot welding guns 19 and 21 press-hold the inner panel 3A and the outer panel 5A at positions closer to the vertical walls 3Aw and 5Aw than the convex portions 3Ab and 3Ac to form spot welded portions 7A and 9A.
  • the second gap t2 formed by forming the spot welds 7A and 9A is closer to the vertical walls 3Aw and 5Aw.
  • the inner panel 3A and the outer panel 5A can be joined in a state where the vertical walls 3Aw and 5Aw are further brought close to each other, and the welding strength can be improved to contribute to the rigidity improvement of the vehicle body 25.
  • the plurality of panel members are constituted by the inner panel 3A and the outer panel 5A used for the vehicle body of the automobile, and the door opening 27 is formed inside the flanges 3Af and 5Af. Thereby, the rigidity of the vehicle body 25 including the door opening 27 can be enhanced.
  • FIG. 8 is data in a state where the accuracy of the shapes of the flanges 3Af and 5Af hardly varies.
  • FIG. 9 shows a state in which there is a variation in the accuracy of the shapes of the flanges 3Af and 5Af.
  • the second gap t2 has a large value in the range of 0.3 mm to 0.05 mm.
  • the variation in shape accuracy is the variation in clearance between the flanges 3Af and 5Af when they are superimposed.
  • FIG. 10 when the convex portions 3Ab and 3Ac are not formed, spot welded portions are formed at two places similar to FIG. 6 so that an appropriate gap is formed between the flanges 3Af and 5Af. It shows the displacement of the gap when laser welding is performed. According to this, the gap between the flanges 3Af and 5Af at the time of laser welding has almost a value exceeding 0.3 mm.
  • the second gap t2 can be accommodated within the appropriate range of 0.05 mm to 0.3 mm.
  • FIG. 11 to FIG. 14 show an example of formation of the convex portion in the case where three panel members are used.
  • the panel members 37 and 39 are disposed on both sides of the panel member 35 with the panel member 35 interposed therebetween, thereby overlapping three panel members.
  • the panel material 37 located at the top in FIG. 11 does not have a convex portion.
  • the panel member 35 positioned in the middle includes a convex portion 35 a, and the panel member 39 positioned at the lowermost portion in FIG. 11 includes a convex portion 39 a.
  • the protruding portions 39a have substantially the same protruding height as the protruding portions 35a, but the size (area) in plan view is large.
  • the center of the convex portion 35a and the center of the convex portion 39a coincide with each other.
  • the front end surface of the convex portion 35 a of the panel member 35 is in contact with the panel member 37.
  • a first gap t11 is formed between the panel material 35 and the panel material 37.
  • the tip end surface of the convex portion 39 a of the panel material 39 is in contact with a portion provided with the convex portion 35 a of the panel material 35.
  • a first gap t12 is formed between the panel material 35 and the panel material 39.
  • the first gap t11 and the first gap t12 are equal.
  • three panel members are overlapped by arranging the panel members 43 and 45 on both sides of the panel member 41 with the panel member 41 interposed therebetween.
  • the panel member 43 positioned at the top in FIG. 12 does not have a protrusion.
  • the panel member 41 positioned in the middle includes a convex portion 41a, and the panel member 45 positioned at the lowermost portion in FIG. 12 includes a convex portion 45a.
  • the convex portion 41a is larger in size (area) in plan view than the convex portion 45a, and the convex portion 45a has a projection height higher than the convex portion 41a.
  • the center of the convex portion 41a and the center of the convex portion 45a coincide with each other.
  • the front end surface of the convex portion 41 a of the panel member 41 is in contact with the panel member 43.
  • a first gap t11 is formed between the panel material 41 and the panel material 43.
  • the tip end surface of the convex portion 45 a of the panel material 45 enters the concave portion on the back side of the convex portion 41 a of the panel material 41 and is in contact with the inner surface of the convex portion 41 a.
  • a first gap t12 is formed between the panel material 41 and the panel material 45.
  • the first gap t11 and the first gap t12 are equal.
  • the panel members 49 and 51 are disposed on both sides of the panel member 47 with the panel member 47 interposed therebetween, thereby overlapping three panel members.
  • the panel material 47 located in the middle has no convex portion.
  • the panel member 49 positioned at the uppermost portion in FIG. 13 includes a convex portion 49a, and the panel member 51 positioned at the lowermost portion in FIG. 13 includes a convex portion 51a.
  • the protrusions 49 a and the protrusions 51 a have the same shape, and both protrude toward the panel material 47. That is, the convex portion 49 a and the convex portion 51 a are opposed to each other with the panel material 47 interposed therebetween. At this time, a first gap t11 is formed between the panel material 47 and the panel material 49, and a first gap t12 is formed between the panel material 47 and the panel material 51. The first gap t11 and the first gap t12 are equal.
  • the panel members 55 and 57 are disposed on both sides of the panel member 53 with the panel member 53 interposed therebetween, thereby overlapping three panel members.
  • the panel member 55 positioned at the top in FIG. 14 does not have a protrusion.
  • the panel member 53 positioned in the middle includes a convex portion 53a, and the panel member 57 positioned at the lowermost portion in FIG. 14 includes a convex portion 57a.
  • the convex portions 53a and the convex portions 57a have the same shape as each other, but are shifted along the surface direction of the panel material.
  • the convex portion 53 a of the panel member 53 abuts on the panel member 55, whereby a first gap t 11 is formed between the panel member 53 and the panel member 55.
  • the convex portion 57a of the panel member 57 is in contact with the panel member 53 in the vicinity of the convex portion 53a, whereby a first gap t12 is formed between the panel member 53 and the panel member 57.
  • the first gap t11 and the first gap t12 are equal.
  • the first gaps t11 and t12 are set to about 1.0 mm as in the first gap t1 shown in FIG. 4A. Then, spot welding is performed using spot welding guns 19 and 21. At this time, the gap between the panel members between the sandwiching positions held under pressure by the spot welding guns 19 and 21 is 0.3 mm to 0.05 mm, similarly to the second gap t2 shown in FIG. 4B. . That is, the first gaps t11 and t12 (1 mm) become the second gaps (0.3 mm to 0.05 mm).
  • laser light is irradiated between the spot welds, for example, from the panel members 37, 43, 49, 55 side to carry out laser welding, and the laser welds are Form.
  • the laser welded portion is formed in a state in which the second gap is secured to be 0.3 mm to 0.05 mm, which is an appropriate gap.
  • the plurality of panel members are pressed and held from both sides by the spot welding guns 19 and 21, but instead of the spot welding guns 19 and 21, clamping is performed from both sides of the panel members by clamp arms. It is also good. In this case, laser welding is performed while the panel material is clamped by the clamp arm.
  • the first and second panel members 3 and 5 may be provided with convex portions that abut each other.
  • the outer panel 5A in place of the projections 3Ab and 3Ac of the inner panel 3A, the outer panel 5A may be provided with projections projecting toward the inner panel 3A. And the convex part which mutually abuts on both the outer panel 5A may be provided.
  • a vehicle body panel material of an automobile has been described as an example, but it is not limited to the vehicle body panel material of an automobile.
  • the present invention is applied to a laser welding method and a laser weldment for joining a plurality of panel materials stacked on each other.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

Selon le procédé de soudage au laser de l'invention, l'un de deux matériaux en panneaux (3, 5) est pourvu de parties en saillie (3b, 3c) qui font saillie vers l'autre matériau en panneau, et le procédé comprend une étape de superposition des matériaux en panneaux, les parties en saillie (3b, 3c) venant en butée contre l'autre matériau en panneau afin de former un premier espace (t1) entre les matériaux en panneaux. Le procédé comprend également : une étape de serrage des matériaux en panneaux superposés (3, 5) à l'aide d'un outil de serrage (19, 21) de telle sorte que le premier espace (t1) devient plus étroit au niveau de positions serrées (7, 9) différentes des parties en saillie (3a), pour former un second espace (t2) plus étroit que le premier espace (t1) entre les matériaux en panneaux, du côté opposé aux parties en saillie (3a) par rapport aux positions serrées (7, 9) ; et une étape de soudage au laser des matériaux en panneaux au niveau de l'emplacement dans lequel a été formé le second espace (t2).
PCT/JP2017/019714 2017-05-26 2017-05-26 Procédé de soudage laser et objet soudé au laser Ceased WO2018216199A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007000909A (ja) * 2005-06-24 2007-01-11 Nissan Motor Co Ltd レーザ溶接装置およびレーザ溶接方法
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